Overview: www.DataSheet4U.com Freescale Semiconductor Advance Information Document Number: MC34671 Rev. 1.0, 01/2008 High Input Voltage 600mA Charger for Single-cell Li-Ion Batteries 34671 The MC34671 is a cost-effective fully-integrated battery charger for POWER MANAGEMENT IC Li-Ion or Li-Polymer batteries. The high input voltage, up to 28V, eliminates the input over-voltage-protection circuit required in handheld devices such as cell phones, Bluetooth accessories and MP3 players. A typical charge cycle includes trickle, constant-current (CC) and constant-voltage (CV) charge modes. The CC-mode current is programmable up to 600mA with an external resistor. The voltage across the external resistor is also used to monitor the actual charge EP SUFFIX (PB-FREE) 98ASA10774D current. The constant voltage is fixed at 4.2V with 0.7% accuracy over 8-PIN UDFN a -20°C to 70°C temperature range. The trickle-mode current is preset to 20% of the CC-mode current when the battery voltage is lower than the trickle-mode threshold. The end-of-charge (EOC) current threshold is preset to 10% of the CC-mode current to save the board space and ORDERING INFORMATION cost. A charge current thermal foldback feature limits the charge current when the IC internal temperature rises to a preset threshold. Temperature Device Package Range (TA) The MC34671 also protects the system with its input over-voltage protection (OVP) feature. In addition, the MC34671 has a 2.6V falling MC34671AEP/R2 -40°C to 85°C 8-UDFN power-on-reset (POR) threshold, making it perfect to work with current limited power supplies. Three indication pins (PPR, CHG and FAST) can be simply interfaced to a microprocessor or LEDs. When no power supply is connected, or when disabled, the charger draws less than 1.0µA leakage current from the battery.
